Measurement of RadiativeJψDecays inKK¯States

The decays $\frac{J}{\psi }\to \gamma K^{+}{K}^{-}$ and $\gamma K_S^0{K}_S^0$ have been studied by use of 8.6×${10}^6$ $\frac{J}{\psi }\text{'}\mathrm{s}$ produced in the DM2 detector. Clean and well-separated signals of $f_2^{\prime }\mathrm{}\left(1525\right)\mathrm{}$ and $f_2\mathrm{}\left(1720\right)\mathrm{}$ are observed in both channels and the measured product branching ratios are given. In neither channel is the $\xi \mathrm{}\left(2230\right)\mathrm{}$ seen; upper limits are given. Last, an as-yet-unexplained production of events is observed in the $K_S^0{K}_S^0$ mass spectrum between 2.0 and 2.5 GeV/${\mathit{c}}^2$.